Pipeline Steel Billet Q345B

Pipeline Steel Billet Q345B

Pipeline Steel Billet Q345B is a specialized low-alloy high-strength steel designed to meet the rigorous demands of oil, gas, water, and industrial pipeline construction. Compliant with GB/T 1591-2008 standards, this billet combines exceptional strength, toughness, and weldability—making it an indispensable material for safe, durable, and efficient pipeline systems.

2010 ESTABLISHED

410 EMPLOYEE

363+CLIENTS

13000+ trade

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Product details

This Q345B pipeline steel billet is engineered to balance strength, weldability, and toughness—key requirements for reliable pipeline systems. Its chemical and mechanical properties ensure performance under internal pressure, external loads, and environmental stress, making it a trusted choice for energy and infrastructure projects.

Parameter	Value	Remarks
Standard	GB/T 1591-2008	Low alloy high-strength structural steel
Grade	Q345B	Impact tested at 20℃
Chemical Composition (wt%)
– Carbon (C)	≤0.20	Controlled for weldability in pipeline applications
– Silicon (Si)	≤0.55
– Manganese (Mn)	≤1.70	Enhances strength and toughness
– Phosphorus (P)	≤0.040	Minimized to reduce brittleness in pipeline service
– Sulfur (S)	≤0.040	Low content ensures good weldability and ductility
– Niobium (Nb)	≤0.07	Microalloying element for grain refinement
– Vanadium (V)	≤0.15	Improves strength and heat resistance
– Titanium (Ti)	≤0.20	Enhances toughness and structural stability
– Nitrogen (N)	≤0.012	Controlled to prevent embrittlement
Mechanical Properties
– Yield Strength (ReL)	≥345 MPa	For thickness ≤16mm; critical for pressure resistance
– Tensile Strength (Rm)	470–630 MPa	Ensures integrity under pipeline operating pressures
– Elongation (A)	≥21%	Allows flexibility for pipeline installation/expansion
– Impact Energy (Akv)	≥34 J	At 20℃ (longitudinal specimen), resists fracture from dynamic loads
– Bending Test	180°	Bend diameter: 2a (≤16mm) / 3a (>16mm) for forming pipeline components
Delivery Condition	Hot rolled, normalized, TMCP (Thermo-Mechanical Control Process)	Tailored for pipeline fabrication requirements
Typical Applications	Oil/gas transmission pipelines, water transport pipelines, industrial fluid pipelines, and pressure vessel components	Designed for high-pressure, long-distance, and harsh environment service